I received my set of five today and didn't waste any time.
You need steady hands for soldering on to this drop-in, it's the size of a 5p coin!
I soldered the supplied wires for the LED and soldered the points to allow for memory and Hi-Med-Low sequence.
After a little sanding of the drop-in I placed it inside a Ultrafire C8.
This is all a very much first impressions basis, however the drop-in appears to be fantastic! Low is very low, I'd call it 'near moonlight', it's actually brighter than the typical 0.2L of moonlight - very useful.
Medium is a perfect brightness. Inside a C8 body you can leave medium running until the cows come home without fear of thermal issues.
High is very bright!
Tailcap Measurements
Hi: 3A
Mid: 880mA
Low: 7mA
PWM
Low: ?? - Unable to detect.
Med: 15.4khz
Hi: ?? - Unable to detect.
The PWM on medium is fantastic, this drop-in shows that PWM can work well. Not only is it of a high frequency but also a high duty cycle is implemented. I'm very sensitive to PWM and I'm unable to see evidence of PWM with my eyes.
Low leaves me scratching my head a little, as I'm unable to measure the PWM frequency, which is rather unusual. I'm guessing that the frequency used is too high for my testing method. As you can imagine, I can't see any signs of PWM with my eyes.
Building my first couple of drop-ins has been so much fun, I definitely recommend it to those that haven't done so.
I now have a neutral tinted (T6-3C) C8 and a cool white (T6 1A) C8 with will spaced modes, no flashes, moonlight mode with crazy runtimes and I am able to use all 3 modes without the annoying strobing affects of poorly implemented PWM, the likes of which is found in so many budget lights/drop-ins.
I plan to write up a more in depth write up soon, but this is all for now. :)